Abstract
The intramyocardial capacitance vessels have two functional components, unstressed volume and ordinary capacitance. The estimated value of unstressed volume was about 5% of the left ventricular mass, and the time constant in relation to ordinary capacitance was about 1 s, although both are pressure-dependent. The coronary venous outflow was closely related to the total displaceable blood volume stored in the intramyocardial capacitance vessels, i.e., the more intramyocardial blood volume, the more coronary venous outflow. On the other hand, the diastolic coronary arterial inflow was decreased when the blood volume in the intramyocardial vessels increased above the unstressed volume. This may be important as a mechanical control of the coronary circulation system.
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